webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = (env, argv) => {
  const isProduction = argv.mode === 'production';

  return {
    entry: './src/js/notice.js',
    output: {
      path: path.resolve(__dirname, 'dist'),
      publicPath: 'dist/',
      filename: 'notice.js',
      library: {
        name: 'NoticeJs',
        type: 'umd',
        export: 'default'
      },
      globalObject: 'this',
      clean: true
    },
    module: {
      rules: [
        {
          test: /\.js$/,
          exclude: /(node_modules|bower_components)/,
          use: {
            loader: 'babel-loader',
            options: {
              presets: [
                ['@babel/preset-env', {
                  targets: {
                    browsers: ['> 1%', 'last 2 versions', 'not dead']
                  }
                }]
              ],
              plugins: ['babel-plugin-add-module-exports']
            }
          }
        },
        {
          test: /\.scss$/,
          use: [
            MiniCssExtractPlugin.loader,
            {
              loader: 'css-loader',
              options: {
                sourceMap: !isProduction
              }
            },
            {
              loader: 'sass-loader',
              options: {
                sourceMap: !isProduction
              }
            }
          ]
        }
      ]
    },
    plugins: [
      new MiniCssExtractPlugin({
        filename: 'noticejs.css'
      })
    ],
    devtool: isProduction ? false : 'source-map'
  };
};